Fuse plug



B. L. MOSS AND J. SCHURY.

v FUSE PLUG APPLICATION FILED OCT 28, 1919;

1,487,905, v Patented Dec. 5, 1922.

Patented Dec. 5, 1922.

UNITED STATES PATENT OFF I C E BENJAMIN L. MOSS AND J OHN SCHURY, 012 DETROIT, MICHIGAN.

FUSE PLUG.

Application filed October 28, 1919.

To aZZ whom it may concern:

Be it known that we, BENJAMIN 1.. Moss, a citizen-of the United States, and Jorin SoHURY, a subject of the Government of Austria, both residing at Detroit, in the county of Wayne and State of Michigan,

have invented certain new and useful Improvements in Fuse Plugs, of which the following is a specification.

This invention relates to that type of fuse plugs used in conection with electric light sockets or the like, and has for its object to provide an improved fuse plug having a plurality of fuses which are successively brought into operative position, so that when one fuse blows another may be connected, the successive connections being affected by turning a central movable member or block which carries the fuse wires.

The invention is illustrated in the accompanying drawings in which Fig. 1 is a side elevation of the plug. Fig. 2 is a side elevation of the block or member which is rotatable within the casing or outer part of the plug. Fig. 3 is a top view of the casing with the central member removed. Fig. 4 is av section on the line 4-4 of Fig. 3. Fig. 5 is a top view of the lug. section on the line 66 of ig. 1.

The plug comprises an outer casing or cylindrical. member indicated at 6, having an enlarged upper part 7. This is made of porcelain, fibre, or other insulating material and is provided externally with a threaded shell 8 which screws into the ordinary socket not shown.

Fitting within this casing, in such manner that it may be turned therein, is a circular block 9, made of. insulating material, and the exterior of this block is provided with a series of longitudinal grooves 10 in each of which is placed a fuse wire or element 11, which is connected at one end to a bottom plate or washer 12 having a central stud 13 which when the parts are assembled projects through the hole 14 in the bottom of the outer member 6 and forms the central contact of the plug. At the upper or opposite end the fuse wire is soldered or otherwise connected to a contact plate 15 which is set in a ratchet notch or depression 16 formed in the rim 17 of the block 9, and this rim fits and turns in an annular channel or depression 18 in the. top of the member 6. Above the notched rim the block 9 has a flange or cover part 19 which rests against a shoulder Fig. 6 1s a- Serial No. 333,957.

20 formed at the top of the member 6, and block 9 is also provided with a finger piece 21 which may be grasped to turn the block to bring successive fuses into position.

The outer contact shell 8 is connected by a piece of metal 22 to a contact spring or detent 23 which when the parts are as-.

turn the block 9 in clockwise direction until the spring piece 23 snaps into the next notch 16 into contact with the plate 15 therein, thereby connecting a new fuse 11 in the circuit. And so the block may be turned to bring successive fuses into position as fast as they burn out. The spring 23 acts as a detent by engaging in the ratchet notch 16 to prevent reverse turn of the block. When all the fuses are used the cap 24 may be taken off and the block 9 lifted out and a new one substituted. Or new fuses may be placed in the old block.

The device will be found very useful in connection with electric light circuits in which fuses of the plug type are used.

We claim:

1. A fuse plug comprising a hollow outer casing having an external threaded shell adapted to be screwed into asocket and an internal spring contact connected to said shell, and projecting inwardly from the side wallof the casing in a tangential direction, and an inner cylindrical grooved block having a notched rim near its outer end and rotatable in the casing and having a plurality of fuses all connected at their inner ends to a common central terminal .at the inner end of the block and connected at the other ends to contact pieces in said notches, and exposed at the side of the block only and adapted to be closed against said spring contact in succession, by turning the block in the casing.

2. A fuse plug comprising a hollow outer casing having an external threaded shell adapted to be screwed into a. socket, a spring detent contact located within, and adjacent to the side wall of, said casing, and connected to said shell through an opening in the casing, and a cylindrical block rotatable in the casing and having external ratchet recesses cooperating with said detent, a plurality of fuses all connected at one end to a common central terminal and each connee-ted at the other end to a contact piece,

said contact pieces being spaced around the periphery of the block in said recesses and presented laterally to be closed against said spring contact in succession, by turning the block in the casing.

3. A. multiple fuse plug, having a plurality of fuses adapted to be successively turned to circuit closing position, contacts contact wall, and each of said contact Walls being located in a separate ratchet rems in the plug cooperating'with said detent.

In testimony whereof, we afiix our signatures in presence of two witnesses.

BENJAMIN L. Moss. JOHN scanner.

Witnesses:

Jonson R FoRREsTER, IDA HAGEN. 

